Hydrastine

Hydrastine ((-)-β-Hydrastine; (1R,9S)-β-Hydrastine) is a selective competitive inhibitor of tyrosine hydroxylase (TH), inhibiting dopamine biosynthesis (IC50=20.7 μM, PC12 cells). Hydrastine also inhibits the organic cation transporter OCT1 (IC50=6.6 μM). Hydrastine may cause neuronal toxicity through mitochondrial dysfunction rather than oxidative stress damage, and can aggravate cell apoptosis when combined with L-DOPA. Hydrastine can be used to study Parkinson's disorder-related dopaminergic neuronal damage[1][2].